Study On Dehydrogenase Activity In SBR Process Enhanced By Humic Soil

Humic activated sludge process is a derivative process of activated sludge process.By adding humus fillers to the sewage treatment system,the microorganism is enriched on its surface to form humic ecological base,the characteristics of activated sludge are improved and the effect of pollutant removal is improved.The purpose of this project is to further study the change rule of dehydrogenase activity in humus activated sludge.By setting up humic soil SBR process traditional SBR process experiment with different temperature,operation modes and carbon sources,the effect of the process,the removal efficiency of pollutants,and the variation of dehydrogenase?DHA?activity in humic activated sludge were investigated under different operating conditions.It provided basic theoretical for the development of humic activated sludge process.The experiment set two different water temperature conditions,room temperature 25?and low temperature 10?,respectively.The results showed that under room temperature conditions,compared with traditional SBR process,the humic SBR process had less effect on the removal of COD and NH₄⁺-N,the removal rate increased by 1.9%and 2.4%,respectively,and the removal efficiency of TP was better,the removal rate increased by 8.2%,reached 85.2%.The humic SBR process experiment results under low temperature conditions showed that the removal rate of COD had little effect,the removal rate of NH₄⁺-N decreased,and the removal rate of TP increased.In the two typical operating cycles?initial aeration phase and stable operation phase?,the TTC-DHA activity of the humified SBR system at room temperature increased by 44.77%and 40.59%,respectively,compared with that under low temperature conditions;the activity of INT-DHA increased 20.31%,24.39%,respectively.During the typical operating cycles,compared with under low temperature conditions,the TTC-DHA activity of the conventional SBR system at room temperature was increased by 44.47%and 20.31%,the activity of INT-DHA increased by 40.59%and 20.31%,respectively.In general,increased temperature could improve the dehydrogenase activity and pollutant removal efficiency of humic activated sludge.Under room temperature conditions,compared the results of inner set humic soil SBR process with operation mode of aerobic/anaerobic and anaerobic/aerobic at25?showed that the operation mode had little effect on the removal rate of COD and NH₄⁺-N,and the removal efficiency of TP under operation mode of anaerobic/aerobic was not significant,the removal rate increased by 1.5%.At the end of two typical operating cycles,the average TTC-DHA activity of the aerobic/anaerobic system at the initial aeration stage and stable operation stage was higher than anaerobic/aerobic system,which improved by 8.64%,25.33%,and9.32%,respectively,the average of INT-DHA activity improved by 7.21%,0.8%,and0.26%,respectively.This showed that for the humic SBR process,aerobic/anaerobic operating mode could improve the activity of dehydrogenase.Under room temperature,the humic soil SBR process using glucose and starch as the carbon source for influent,respectively,the result showed that different carbon source had little effect on NH₄⁺-N removal efficiency,the removal rate of TP was relatively higher when glucose was used as the carbon source.Took the starch as influent carbon source,the removal rate of COD was 7.1%higher than that used glucose as influent carbon source.At the initial of aeration stage,stable operation stage and at the end of the operation,the average of TTC-DHA activity in glucose carbon source system was higher than starch carbon source system,which was 10.74%,20.12%,and 20.22%,respectively,and the average of INT-DHA activity in the initial aeration stage was 16.97%higher,during the middle and end of the operation,the of INT-DHA activity decreased.The experiment results showed that the humic soil SBR process with glucose as carbon source had higher dehydrogenase activity than starch carbon source.